Swedish diplomat Raoul Wallenberg, who had saved thousands of Jews from the Holocaust, was taken into Soviet custody during the Siege of Budapest and was never seen in public again.

Raoul Gustaf Wallenberg was a Swedish architect, businessman, diplomat, and humanitarian. He saved thousands of Jews in German-occupied Hungary during the Holocaust from German Nazis and Hungarian fascists during the later stages of World War II. While serving as Sweden's special envoy in Budapest between July and December 1944, Wallenberg issued protective passports and sheltered Jews in buildings which he declared as Swedish territory.

The Holocaust, known in Hebrew as the Shoah, was the genocide of European Jews during World War II. From 1941 to 1945, Nazi Germany and its collaborators systematically murdered some six million Jews across German-occupied Europe, around two-thirds of Europe's Jewish population. The murders were committed primarily through mass shootings across Eastern Europe and poison gas chambers in extermination camps, chiefly Auschwitz-Birkenau, Treblinka, Belzec, Sobibor, and Chełmno in occupied Poland. Separate Nazi persecutions killed millions of other non-Jewish civilians and prisoners of war (POWs); the term Holocaust is sometimes used to include the murder and persecution of non-Jewish groups.

The siege of Budapest or battle of Budapest was the 50-day-long encirclement by Soviet and Romanian forces of the Hungarian capital of Budapest, near the end of World War II. Part of the broader Budapest Offensive, the siege began when Budapest, defended by Hungarian and German troops, was encircled on 26 December 1944 by the Red Army and the Romanian Army. During the siege, about 38,000 civilians died through starvation, military action, and mass executions of Jews by the far-right Hungarian nationalist Arrow Cross Party. The city unconditionally surrendered on 13 February 1945. It was a strategic victory for the Allies in their push towards Berlin.